23278370691 has 16 divisors (see below), whose sum is σ = 33202389024. Its totient is φ = 14455455744.

The previous prime is 23278370683. The next prime is 23278370693. The reversal of 23278370691 is 19607387232.

It is not a de Polignac number, because 23278370691 - 2³ = 23278370683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23278370691.

It is not an unprimeable number, because it can be changed into a prime (23278370693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2347830 + ... + 2357723.

It is an arithmetic number, because the mean of its divisors is an integer number (2075149314).

Almost surely, 2^23278370691 is an apocalyptic number.

23278370691 is a deficient number, since it is larger than the sum of its proper divisors (9924018333).

23278370691 is a wasteful number, since it uses less digits than its factorization.

23278370691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705670.

The product of its (nonzero) digits is 762048, while the sum is 48.

The spelling of 23278370691 in words is "twenty-three billion, two hundred seventy-eight million, three hundred seventy thousand, six hundred ninety-one".